The Huntington Pavilion:

Huntington-Hill Imaging Center - CT scans, MRI scans, X-Rays and more, this is a large, modern, full-service medical imaging facility. Note that their private entrance is outside the building at the South end.

The 4th floor is entirely occupied by USC Specialists: "The University of Southern California’s long tradition of serving residents of the San Gabriel Valley continues in its expanded medical office at the Keck Medicine of USC – Pasadena, a facility licensed by Keck Hospital of USC. This location is USC’s largest specialty physician office outside of the main Health Sciences Campus, offering nearly 24 specialties, including cardiology, dermatology, endocrinology, oncology, neurosurgery, occupational therapy, plastics and reconstructive surgery, urology and more."